A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

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"There could well have been something there that I hadn't seen. There was 15 to 20 people in a room, and you get confronted with a document that is real and are told that it's happened, only to find out that it hasn't happened."

Ms Gillard, who called for Mr Brough to be disendorsed on Wednesday, said his explanation did not stack up.

"Mr Brough has got a lot of explaining to do," she said.

David Carter, a former chef at the restaurant who sent out the menu on Twitter this week, said he had no specific evidence the menu was shown to guests at the LNP fundraiser.

Mr Carter had left the restaurant six months before the dinner and was not there on the night.

He said Mr Richards - a well-known business figure in Brisbane who has connections with politicians from both major parties - had a history of writing joke menus for fundraisers.

"He's always been very quick to be the first one to point it out to everyone and hand it around," Mr Carter told Sky News.

Debate raged on Wednesday about the menu, associated with a fundraiser for Liberal National Party candidate Mal Brough, that described a dish as: "Julia Gillard Kentucky Fried Quail - Small Breasts, Huge Thighs & A Big Red (word deleted) ...".